49 big ones.
I still have the physique, strength and endurance of a fit 25-year-old, since I have been working out all of my adult life. Unfortunately, I also have a couple of joints that tell a different story, including a small tear in my right rotator cuff that is on the precipice of requiring surgery.
Two observations:
1. My 40th birthday hit me the hardest. None before that and none since.
2. Where has all the time gone?